/Engine/Source/Runtime/Core/Public/Algo/LegacySort.h
Sort elements using user defined predicate class. The sort is unstable, meaning that the ordering of equal items is not necessarily preserved. This is the internal sorting function used by Sort overrides. This used to beAlgo::Sortand is now considered legacy.
namespace AlgoImpl { template<typename T, typename ProjectionType, typename PredicateType> void AlgoImpl::LegacySortInternal ( T * First, int32 Num, ProjectionType Projection, PredicateType Predicate ) }